According to an article posted today, Matthew Lewis attended the Telford Comic Con this past Saturday. So far I have not been able to find any photos of Matthew at the event, but if you attended be sure to send them in: webmiss[at]magical-menagerie[dot]com! (there is also a possibility that it isn’t true because this is the only article that mentioned it)
Warwick Davis, who plays Flitwick and the Choir Instructor was also at the convention as well as a few stars from BBC’s Merlin (which, if you don’t watch yet, I highly recommend)